— Would you mind _____ me to carry the box? It's too heavy.
— Not at all.
A:to help
B:help
C:helping
D:helped
地中海是西方文明的发源地。公元2世纪,地跨欧亚非三大洲,把地中海变成为它的内湖的帝国是( )
下列物质属于纯净物的是 ( )